六氯苯和重金属复合污染沉积物的电动力学修复研究.PDFVIP

　　　 20094 27 2 105 ＊ 李泰平　袁松虎　林　莉　万金忠　徐　懿　陆晓华 (, 430074) :以某化工厂排污沟渠中受六氯苯(hexachlorobenzene, HCB)、锌和镍复合污染的实际沉积物为对象, 研究 离子表 面活性剂OP-10 对沉积物中污染物的增溶解吸效果和电动力学修复污染物的强化迁移效果。 解吸实验结果表明:OP- 10 对HCB 增溶解吸效果较好, 对重金属离子的解吸有 一定的促进作用。 电动力学修复发现, 随电渗析流进入沉积物 中的OP-10 很快的吸附在靠近阳极沉积物上, 从而阻碍了助剂的输送并影响HCB 的迁移, 而靠近阴极区域沉积物中 的有机质迁移会促进HCB 的去除。沉积物pH 变化引起的重金属沉淀是制约锌迁移的主要因素。 镍的整体迁移效果 不明显。 :沉积物;六氯苯;重金属;OP-10;电动力学修复 STUDY ON THE ENHANCED ELECTROKINETIC REMEDY OF A REAL SEDIMENT CONTAMINATED WITH HEXACHLOROBENZENE AND HEAVY METALS Li Taiping　Yuan Songhu　Lin Li　Wan Jinzhong　 u Yi　Lu iaohua (Environmental Science Research Institute, Huazhong University of Science and Technology, Wuhan 430074, China) Abstract:The desorption and enhanced electrokinetic (EK)remedy of hexachlorobenzene (HCB), zinc and nickel from a real contaminated sediment with nonionic surfactant OP-10 were investigated.The real sediment contaminated with multiple pollutants for decadeswere sampled from the ditch of a chemical plant.From the desorption experiment, it was demonstrated that HCB was effectively removed from the sediment and the desorption of heavy metals was also enhanced by OP-10.At the end of electrokinetic process, itwas observed that the remedy of HCBwashalted with the result of the adsorption ofOP-10 on sediments, but was assisted by the migration of sediment organic content.The electromigration of zincwas dependent on the distribution of sediment pH.It was found that the migration of nickel was not obvious in sediments. Keyw rds:sediment;hexachlorobenzene (HCB);heavy metals;OP-10;electrokinetic remedy 0　 。